What I like about Lisp is that, for example, a configuration file can be written directly in Lisp (as opposed to, say, XML or JSON), in which case it can simply

What I like about Lisp is that, for example, a configuration file can be written directly in Lisp (as opposed to, say, XML or JSON), in which case it can simply execute itself (i.e. without the need to have a separate interpreter to parse the text and to apply the configuration settings) - and it still would look like a configuration file rather than a piece of executable code.